SQL Server：显示订单数多于指定客户的客户列表

Question

Yop伙计们，我有这个小问题需要解决;我有两个由CustomerID链接的表[Customers]和[Orders]。每个客户都可以轻松获得订单的COUNT（）......

SELECT c.CompanyName, COUNT(*) AS [Nbr of Orders]
FROM [Orders] o
INNER JOIN [Customers] c
ON c.CustomerID = o.CustomerID
GROUP BY c.CompanyName

但问题来自问题的最后部分：我需要获得该列表，但只有那些订单多于其中一个客户的订单（c.CompagnyName =＆＃39; XYZ＆＃39;） 我试图添加类似这个WHERE子句

的东西

WHERE COUNT(*) > (SELECT COUNT(*)
                  FROM [Orders] o
                  INNER JOIN [Customers] c
                  ON c.CustomerID = o.CustomerID
                  WHERE c.CompagnyName = 'XYZ')

SQL错误：P 我知道这看起来很荒谬，但如果有人能告诉我我错过的东西！

Answer 1

看起来你可以使用having子句。所以你的榜样就是     SELECT c.CompanyName, COUNT(*) AS [Nbr of Orders] FROM [Orders] o INNER JOIN [Customers] c ON c.CustomerID = o.CustomerID GROUP BY c.CompanyName having count(*) > 1

Answer 2

我认为您需要一个HAVING子句而不是WHERE子句，因为您要对聚合函数进行过滤